EP3235478A1 - Article de lunetterie de protection - Google Patents

Article de lunetterie de protection Download PDF

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Publication number
EP3235478A1
EP3235478A1 EP16165789.5A EP16165789A EP3235478A1 EP 3235478 A1 EP3235478 A1 EP 3235478A1 EP 16165789 A EP16165789 A EP 16165789A EP 3235478 A1 EP3235478 A1 EP 3235478A1
Authority
EP
European Patent Office
Prior art keywords
operator
camera
protective eyewear
radiation
display unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16165789.5A
Other languages
German (de)
English (en)
Inventor
Philipp GEYER
Markus Arndt
Ugur Sezer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Universitaet Wien
Original Assignee
Universitaet Wien
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Universitaet Wien filed Critical Universitaet Wien
Priority to EP16165789.5A priority Critical patent/EP3235478A1/fr
Priority to PCT/EP2017/059113 priority patent/WO2017182431A1/fr
Publication of EP3235478A1 publication Critical patent/EP3235478A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/02—Goggles
    • A61F9/022—Use of special optical filters, e.g. multiple layers, filters for protection against laser light or light from nuclear explosions, screens with different filter properties on different parts of the screen; Rotating slit-discs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/02—Goggles
    • A61F9/022—Use of special optical filters, e.g. multiple layers, filters for protection against laser light or light from nuclear explosions, screens with different filter properties on different parts of the screen; Rotating slit-discs
    • A61F9/023—Use of special optical filters, e.g. multiple layers, filters for protection against laser light or light from nuclear explosions, screens with different filter properties on different parts of the screen; Rotating slit-discs with variable transmission, e.g. photochromic
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0075—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for altering, e.g. increasing, the depth of field or depth of focus
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/0138—Head-up displays characterised by optical features comprising image capture systems, e.g. camera
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/20—Image signal generators
    • H04N13/204—Image signal generators using stereoscopic image cameras
    • H04N13/207—Image signal generators using stereoscopic image cameras using a single 2D image sensor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/344—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] with head-mounted left-right displays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/366—Image reproducers using viewer tracking
    • H04N13/376—Image reproducers using viewer tracking for tracking left-right translational head movements, i.e. lateral movements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/366—Image reproducers using viewer tracking
    • H04N13/383—Image reproducers using viewer tracking for tracking with gaze detection, i.e. detecting the lines of sight of the viewer's eyes

Definitions

  • the invention relates to protective eyewear for protection of an operator's eyes against radiation, in particular laser radiation.
  • conventional laser safety glasses are made of materials capable of reflecting or absorbing at the wavelength of the laser light but transmitting other wavelengths. This enables the operator to navigate in the laboratory and perform work.
  • selectively filtering safety glasses entail numerous drawbacks.
  • the known safety glasses have to be designed for absorption at a particular wavelength or wavelength band so that their use is restricted to specific laser equipment.
  • the optical density at the laser wavelength must be sufficiently high to achieve the required safety level. If they block the light entirely, the operator cannot see the lab environment anymore.
  • Q-switched lasers emit radiation on individual but widely separated lines, such as for example Nd:YAG lasers, with lines at 1064 nm, 532 nm, 355 nm, 266 nm, 213 nm and pulse energies up to several Joules in the infrared spectrum. Eye protection against all these wavelengths usually requires enormous protective levels, effectively impairing the clear sight on the experiment. This finally also holds for Q-switched or continuous OPO's (optical parametric oscillators) which during a single color scan in spectroscopy applications (over a few seconds) may vary their wavelength continuously for instance from about 200 nm to well beyond 2000 nm, i.e. covering most of all ultraviolet, visible and near infrared wavelengths.
  • OPO's optical parametric oscillators
  • the camera includes a CCD or CMOS cell and a focusing optics as known from conventional digital cameras.
  • An image reproduction screen is provided in front of the operator's eyes.
  • the output signal from the camera is received by an image processing unit, which drives the image reproduction screen.
  • the protective goggles of the instant invention at least comprise
  • a light field camera also known as plenoptic camera
  • plenoptic camera is meant to encompass any camera capable of capturing the four-dimensional spatio-angular radiance distribution of the light rays incident on its image sensor.
  • a light field camera not only captures information about the intensity of light in a scene, but also captures information about the direction that the light rays are traveling in space.
  • the light field camera is of a type known in the prior art using an array of micro-lenses placed in front of an image sensor to sense intensity, color, and directional information of the incident light. Similar information can be obtained with an array of fixed focus micro-cameras.
  • the depth of field of images captured with the light field camera and making up the video signal is superior to conventional digital cameras.
  • the light field camera allows larger regions of an image, or even the entire image, to be in focus even for scenes with features arranged over a large depth as usually experienced in a laser laboratory (several centimeters to beyond several meters).
  • the light field camera offers great flexibility for data processing.
  • the processing unit may be arranged for refocusing the images of the video signal after they have been captured.
  • the light field camera can capture a video signal from different perspectives with fewer lags than conventional digital cameras, as there is less need to refocus a lens system during movement of the operator or changes in the surrounding of the operator.
  • the light field camera is particularly advantageous in use with the protective goggles.
  • the increased depth of field is a crucial safety feature as it allows to see sharp on all levels relevant for the operator's work.
  • Enhanced data processing possibilities allow to process and transmit the video signal from the light field camera to the display unit, which in principle is faster than a mechanical lens focusing system. This reduces the occurrence of motion sickness and supports maintaining fine motor skills even with protective eye wear in place. It is an achievement of the invention that the operator may be provided with a clear and bright 3D (full color) vision and sharp focus on all objects in the operator's field of view or in his pupil's line of sight. Because of the possibility of digital processing of the 3D image, focusing corrections can be computed into the image to compensate for the operator's visual defects, if a light-field display is incorporated. This allows for more compact goggles than needed without such correction.
  • the camera based protective eyewear inherently provides higher laser safety levels even for stray light. While the eye would be in danger of collimated millimeter sized beams in excess of 1 mW, a camera might sustain higher powers without damage and even provide clear vision at lower light levels.
  • the display unit comprises a light field display.
  • Such light field displays have been proposed in the prior art.
  • One example thereof is disclosed in WO 2014186625 A1 .
  • the light field display is capable of reproducing the depth features of the images captured with the light field camera. In this way, essentially the entire video stream presented to the operator at the display unit is sharp.
  • the sharpness of the video stream is maintained essentially without lags in case of movements of the operator's head or eyes.
  • a key characteristic of light field displays is their capability to reproduce naturally the depth features of an image. This way the stereoscopic perception and the depth information delivered to each eye can be made consistent. This shall eliminate motion sickness.
  • the protective eyewear comprises a display other than a light-field display, for example based on LCD, LED or OLED.
  • the processing unit may be arranged for processing the data from the light field camera such that it creates an overall sharp image. Due to the human eyes' property of seeing sharp only at the point of gaze this embodiment also provides for a natural viewing experience.
  • the protective eyewear comprises an eye tracker for measuring the point of gaze of the operator.
  • the eye tracker may comprise an eye tracking camera for measuring the direction where the operator is looking, i.e. the point of gaze.
  • Such eye trackers are per se known in the art.
  • This embodiment is particularly advantageous if a light field display is not available.
  • the display unit may be based on LCD, LED, OLED or other known technology in the prior art.
  • the eye tracker is connected to the processing unit, which, depending on the signal of the eye tracker, processes the data from the light field camera such that the focus of the images displayed on the display unit fits to the point of gaze of the operator.
  • the processing of the signal based on the input from the eye tracker preferably includes an adaptation of the focus.
  • the digital processing of the image data from the light field camera is significantly faster than adaptations of the autofocus in conventional digital cameras, and requires less computing resources than the generation of an overall sharp image.
  • a preferred embodiment provides for a beam blocker, preferably made of an opaque material, in particular metal or (carbon-)fiber-reinforced plastic, being arranged on the head-mounted support at the back side of the display unit, e.g. between the display unit and the camera.
  • the beam blocker In the normal position of use on the operator's head, the beam blocker is arranged such that harmful radiation, in particular laser radiation, is prevented from reaching the operator's eyes.
  • the protective eyewear comprises a back-up camera with a beam blocking device movable between a closed state and an open state.
  • a beam blocking device is made from an opaque material for shielding the sensor of the back-up camera in the closed state of the beam blocking device.
  • the back-up camera may transmit a video stream of the surrounding of the operator to the display unit.
  • the processing unit is connected to a drive unit for transferring the beam blocking device of the back-up camera from the closed state to the open state upon detection of a failure of the (primary) camera(s).
  • the mechanical beam blocker of the back-up camera may be manually moved from the closed state to the open state.
  • the protective eyewear comprises a gyro sensor and/or a tilt sensor and/or an accelerometer for monitoring a position of the operator's head.
  • at least one of the gyro sensor, tilt sensor and accelerometer is connected to the processing unit, in particular for detecting an emergency situation based on the information from the gyro sensor, tilt sensor or accelerometer.
  • the protective eyewear comprises a wireless network unit for connecting to a radiation interlock of a radiation source producing the radiation.
  • a remote control of the radiation source which preferably is a laser arrangement, may be achieved.
  • the processing unit is arranged for activating a radiation interlock for disabling the radiation upon detection of a failure of the camera.
  • the protective eyewear comprises an operating unit operable by the operator, the operating unit being arranged for at least one of activating or deactivating the radiation interlock and controlling at least one operating parameter of a radiation source.
  • Fig. 1 shows a protective eyewear (or protective goggles) 1 with a head-mounted support 2 to be worn on the head 3 of an operator.
  • the head-mounted support 2 may comprise an optional tightening band 4.
  • the head-mounted support 2 takes the shape of a helmet.
  • the protective eyewear 1 provides protection of the operator's eyes 5 against the harms otherwise caused by intensive radiation 7 from a radiation source 6 (schematically shown in Fig. 1 ).
  • Fig. 1 the protection of the operator's eyes 5 is achieved with a beam blocker 8 at the head-mounted support 2. Facing the operator's eyes 5 and behind the beam blocker 8 a display unit 9 is placed.
  • This display unit 9 contains an optical system 10 arranged in front of or attached to a display 11.
  • the optical system 10 may contain (de-)focusing as well as image correction elements.
  • the display unit 9 of the embodiment shown in Fig. 1 is based on technologies such as LCD, LED, OLED or others.
  • the protective goggles 1 comprise a camera 12 for generating a video stream showing the operator's environment in the laboratory.
  • a processing unit 27 (see Fig. 3 ) communicates with the camera 12 and the display unit 9, respectively.
  • the protective goggles 1 preferably comprise two cameras 12 and two display units 9, one for each eye 5 of the operator. Furthermore, a security unit 26 (see Fig. 3 ) may be present for the case that one of cameras 12 is directly hit by the laser beam 7.
  • camera 12 is a light field camera having an image capturing sensor 13 with an array of micro-lenses 14.
  • the image capturing sensor 13 is placed behind an optical system 15, which projects the observed image onto the image sensor 13.
  • the image capturing sensor 13 may arise from existing technologies like CCD, CMOS, etc.
  • the images captured with the light field camera 12 can be processed either to set the sharpness plane after the image was obtained to any position based on eye tracking or an image can be generated which is sharp in its entire extension.
  • the images captured with light field camera 12 are processed in processing unit 27 to be overall sharp, or alternatively only focused in these regions where the operator is looking at.
  • an optional eye tracker 16 is used to measure the point of gaze of the operator.
  • the eye tracker 16 is connected to the processing (or control) unit 27, which adjusts the focus in the previously captured images such that the images are sharp in direction of the point of gaze of the operator.
  • the eye tracker 16 comprises an eye tracker camera 17 and a light source 18, for example a weak infrared light source, to illuminate the operator's pupil.
  • the display unit 9 comprises a light field display 19 for presenting the images from the light field camera 12 to the operator.
  • the light field display 19 comprises a display 20 with an array of micro-lenses 21 and an appropriate optical system 22.
  • the other components of the protective goggles 1 shown in Fig. 2 may be those of Fig. 1 .
  • less processing of the images from the light field camera 12 is required as the light field display 19 is capable of reproducing the depth features of the images.
  • This approach eliminates the motion sickness some users of VR (Virtual Reality) experience, when the image depth features do not match the stereoscopic properties.
  • the video presented to the operator provides a very natural viewing experience and removes the need of manual focus adjustment and/or having to work with a fixed focus.
  • Fig. 3 shows a block diagram of the protective goggles 1 as depicted in Fig. 1 but having additional features.
  • light-field camera 12 sends real time images of the environment of the operator to the processing unit 27 which contains the required computational power for processing the input signal from the light field camera 12 and for outputting processed image data to the display unit 9 or 19.
  • the processing unit 27 uses the output signal of an optional eye tracker 16 for focusing the processed images to the operator's point of gaze.
  • the optional eye tracker 16 may be dispensed with if a light field display 19 is used, as depicted in Fig. 2 , or if an overall sharp image is computed.
  • the protective goggles 1 may further comprise an operating unit 24 for manipulation by the operator.
  • the operating unit 24 may comprise a set of operation elements, for example a touchpad or knobs, for regulating operating parameters, such as the brightness of the display unit 9, the wavelengths of the radiation source 6 etc.
  • Security unit 26, shown in Fig. 3 may comprise at least one backup camera which is mechanically shuttered and is transferred to an open state only when the primary cameras 12 fail due to direct exposure to radiation exceeding the damage threshold of the used cameras 12.
  • the protective goggles 1 can be augmented with an optional sensor unit 25 comprising a manifold of additional (security) features tracked and triggered by additional sensors.
  • sensor unit 25 may comprise a gyro and/or acceleration sensor for monitoring the position of the operator's head 3. The output signal of these sensors may be used for detecting an emergency situation.
  • Other safety features for example a heart rate monitor or a microphone for communication or recording of audio messages can also be implemented in sensor unit 25.
  • protective goggles 1 may be equipped with a wireless network unit 23, for example a WLAN controller, for connecting to a wireless network.
  • Wireless network unit 23 may be connected via the wireless network to a laser interlock, allowing the wearer of the protective goggles 1 to disable the radiation source 6 in the working place. This may be done through a control panel on the head-mounted support 2.
  • the radiation source 6 can be arranged for automatically disabling the laser interlock when the system notices a failure, for example a failure of camera 12.
  • the control panel may also indicate the on/off status of the radiation source 6 such that the operator knows when it is safe to remove the protective goggles 1 as well as display the status on the lab entering.
EP16165789.5A 2016-04-18 2016-04-18 Article de lunetterie de protection Withdrawn EP3235478A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16165789.5A EP3235478A1 (fr) 2016-04-18 2016-04-18 Article de lunetterie de protection
PCT/EP2017/059113 WO2017182431A1 (fr) 2016-04-18 2017-04-18 Lunettes de protection contre le rayonnement laser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16165789.5A EP3235478A1 (fr) 2016-04-18 2016-04-18 Article de lunetterie de protection

Publications (1)

Publication Number Publication Date
EP3235478A1 true EP3235478A1 (fr) 2017-10-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16165789.5A Withdrawn EP3235478A1 (fr) 2016-04-18 2016-04-18 Article de lunetterie de protection

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EP (1) EP3235478A1 (fr)
WO (1) WO2017182431A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018104465A2 (fr) * 2016-12-07 2018-06-14 Woermann Bernd Appareil pour protéger les yeux d'un rayonnement

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3910159A1 (de) * 1989-03-21 1990-09-27 Stefan Weller Verfahren zum beruehrungsgesteuerten abblenden eines lichtfeldes, das in wenigstens einem schritt auf mindestens einer von vier rechtwinklig zueinander stehenden seiten eines lichtfeldes wirksam ist
US20090231417A1 (en) 2005-06-07 2009-09-17 Commissariat A L'energie Atomique Protective Glasses
CN202362528U (zh) * 2011-10-21 2012-08-01 魏博宁 一种激光防护眼镜
US8334899B1 (en) 2007-11-01 2012-12-18 Jefferson Science Associates, Llc Protective laser beam viewing device
US20140104392A1 (en) * 2012-10-11 2014-04-17 Sony Mobile Communications Ab Generating image information
WO2014186625A1 (fr) 2013-05-17 2014-11-20 Nvidia Corporation Système, procédé et produit programme d'ordinateur servant à produire des images pour un affichage à champ lumineux proche de l'œil

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3910159A1 (de) * 1989-03-21 1990-09-27 Stefan Weller Verfahren zum beruehrungsgesteuerten abblenden eines lichtfeldes, das in wenigstens einem schritt auf mindestens einer von vier rechtwinklig zueinander stehenden seiten eines lichtfeldes wirksam ist
US20090231417A1 (en) 2005-06-07 2009-09-17 Commissariat A L'energie Atomique Protective Glasses
US8334899B1 (en) 2007-11-01 2012-12-18 Jefferson Science Associates, Llc Protective laser beam viewing device
CN202362528U (zh) * 2011-10-21 2012-08-01 魏博宁 一种激光防护眼镜
US20140104392A1 (en) * 2012-10-11 2014-04-17 Sony Mobile Communications Ab Generating image information
WO2014186625A1 (fr) 2013-05-17 2014-11-20 Nvidia Corporation Système, procédé et produit programme d'ordinateur servant à produire des images pour un affichage à champ lumineux proche de l'œil

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